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Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin's epidermis, triggered by a photochemical reaction with ...
Active transport of calcium occurs primarily in the duodenum portion of the intestine when calcium intake is low; and through passive paracellular transport in the jejunum and ileum parts when calcium intake is high, independently of Vitamin D level. [22] Vitamin D metabolism pathway. The active absorption of calcium from the gut is regulated ...
Vitamin D increases absorption of calcium and phosphate in the intestinal tract, leading to elevated levels of plasma calcium, [4] and thus lower bone resorption. Calcitriol (1,25-dihydroxycholecalciferol) is the active form of vitamin D 3. [10] It has numerous functions involved in blood calcium levels.
Vitamin D contributes to your health in several ways and you can up your intake with just a few minutes of sunshine. Here's what else to know. What is vitamin D and why is it important to your health?
Calcitriol is a hormone and the active form of vitamin D, normally made in the kidney. [8] [9] [10] It is also known as 1,25-dihydroxycholecalciferol.It binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. [11]
Calcium regulation in the human body [38] Different tissues contain calcium in different concentrations. For instance, Ca 2+ (mostly calcium phosphate and some calcium sulfate) is the most important (and specific) element of bone and calcified cartilage. In humans, the total body content of calcium is present mostly in the form of bone mineral ...
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